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Message-ID: <20230530072310-mutt-send-email-mst@kernel.org> Date: Tue, 30 May 2023 07:24:06 -0400 From: "Michael S. Tsirkin" <mst@...hat.com> To: syzbot <syzbot+d0d442c22fa8db45ff0e@...kaller.appspotmail.com> Cc: jasowang@...hat.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com, virtualization@...ts.linux-foundation.org, Stefano Garzarella <sgarzare@...hat.com>, stefanha@...hat.com Subject: Re: [syzbot] [kvm?] [net?] [virt?] general protection fault in vhost_work_queue On Tue, May 30, 2023 at 12:30:06AM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 933174ae28ba Merge tag 'spi-fix-v6.4-rc3' of git://git.ker.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=138d4ae5280000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f389ffdf4e9ba3f0 > dashboard link: https://syzkaller.appspot.com/bug?extid=d0d442c22fa8db45ff0e > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/21a81b8c2660/disk-933174ae.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/b4951d89e238/vmlinux-933174ae.xz > kernel image: https://storage.googleapis.com/syzbot-assets/21eb405303cc/bzImage-933174ae.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+d0d442c22fa8db45ff0e@...kaller.appspotmail.com > > general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN > KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] > CPU: 0 PID: 29845 Comm: syz-executor.4 Not tainted 6.4.0-rc3-syzkaller-00032-g933174ae28ba #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/16/2023 > RIP: 0010:vhost_work_queue drivers/vhost/vhost.c:259 [inline] > RIP: 0010:vhost_work_queue+0xfc/0x150 drivers/vhost/vhost.c:248 > Code: 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 75 56 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 8d 7b 70 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 42 48 8b 7b 70 e8 95 9e ae f9 5b 5d 41 5c 41 5d e9 > RSP: 0018:ffffc9000333faf8 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000d84d000 > RDX: 000000000000000e RSI: ffffffff841221d7 RDI: 0000000000000070 > RBP: ffff88804b6b95b0 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000000 R12: ffff88804b6b00b0 > R13: 0000000000000000 R14: ffff88804b6b95e0 R15: ffff88804b6b95c8 > FS: 00007f3b445ec700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b2e423000 CR3: 000000005d734000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > vhost_transport_send_pkt+0x268/0x520 drivers/vhost/vsock.c:288 > virtio_transport_send_pkt_info+0x54c/0x820 net/vmw_vsock/virtio_transport_common.c:250 > virtio_transport_connect+0xb1/0xf0 net/vmw_vsock/virtio_transport_common.c:813 > vsock_connect+0x37f/0xcd0 net/vmw_vsock/af_vsock.c:1414 > __sys_connect_file+0x153/0x1a0 net/socket.c:2003 > __sys_connect+0x165/0x1a0 net/socket.c:2020 > __do_sys_connect net/socket.c:2030 [inline] > __se_sys_connect net/socket.c:2027 [inline] > __x64_sys_connect+0x73/0xb0 net/socket.c:2027 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7f3b4388c169 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f3b445ec168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a > RAX: ffffffffffffffda RBX: 00007f3b439ac050 RCX: 00007f3b4388c169 > RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000004 > RBP: 00007f3b438e7ca1 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f3b43acfb1f R14: 00007f3b445ec300 R15: 0000000000022000 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:vhost_work_queue drivers/vhost/vhost.c:259 [inline] > RIP: 0010:vhost_work_queue+0xfc/0x150 drivers/vhost/vhost.c:248 > Code: 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 75 56 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 8d 7b 70 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 42 48 8b 7b 70 e8 95 9e ae f9 5b 5d 41 5c 41 5d e9 > RSP: 0018:ffffc9000333faf8 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000d84d000 > RDX: 000000000000000e RSI: ffffffff841221d7 RDI: 0000000000000070 > RBP: ffff88804b6b95b0 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000000 R12: ffff88804b6b00b0 > R13: 0000000000000000 R14: ffff88804b6b95e0 R15: ffff88804b6b95c8 > FS: 00007f3b445ec700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b2e428000 CR3: 000000005d734000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess), 5 bytes skipped: > 0: 48 89 da mov %rbx,%rdx > 3: 48 c1 ea 03 shr $0x3,%rdx > 7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) > b: 75 56 jne 0x63 > d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > 14: fc ff df > 17: 48 8b 1b mov (%rbx),%rbx > 1a: 48 8d 7b 70 lea 0x70(%rbx),%rdi > 1e: 48 89 fa mov %rdi,%rdx > 21: 48 c1 ea 03 shr $0x3,%rdx > * 25: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction > 29: 75 42 jne 0x6d > 2b: 48 8b 7b 70 mov 0x70(%rbx),%rdi > 2f: e8 95 9e ae f9 callq 0xf9ae9ec9 > 34: 5b pop %rbx > 35: 5d pop %rbp > 36: 41 5c pop %r12 > 38: 41 5d pop %r13 > 3a: e9 .byte 0xe9 Stefano, Stefan, take a look? > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@...glegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the bug is already fixed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want to change bug's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the bug is a duplicate of another bug, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup
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